Make -- a valid command line option and follow the convention of it being the terminator for all options

[exoosh]

Is your feature request related to a problem? Please describe.

This relates to #863. I encountered it when working around the issue of dotfiles not being shown by setting GLOBIGNORE=".:..", then invoking bats *.bats.

ShellCheck rightly pointed out that confusion could occur between command line options and files starting with -- when using a bare glob.

The convention in most GNU utils these days is to allow -- and assume that this terminates the list of options. Everything past that point is treated as a list of files/directories/items ...

Describe the solution you'd like

I would propose to allow for -- and have it signal the end of the list of options.

Describe alternatives you've considered

Currently I am simply using ./*.bats, which also dodges the issue.